A backdoor virus is therefore a malicious code that, by exploiting vulnerabilities and vulnerabilities of the system, is used to facilitate unauthorized remote access to a computer system or program. Like any malicious code, it runs in the background, oblivious to the victim. This access gives it total freedom to carry out malicious activities on the system. The system is now vulnerable to unauthorized copying, editing, stealing of data and unlawful injections of files.
Backdoor is an undocumented way to access a program, an online service or a complete computer system. A backdoor will bypass normal authentication mechanisms. It is written by the programmer who creates the code for the program and is often only known to the programmer and poses a potential security risk. Also called a hatch.
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Hackers can use a backdoor to install all manner of malware on your computer.
- Spyware is a type of malware that, once deployed on your system, collects information about you, the sites you visit on the Internet, the items you download, the files you open, user names, passwords and any other important element. A less common form of spyware called keyloggers specifically tracks every hit and click you make. Companies can use spyware / keyloggers as a legitimate and legal way to monitor their employees at work.
- Ransomware is a type of malware designed to encrypt your files and lock your computer. To retrieve these precious photos, documents, etc. (or the type of file that attackers choose to target), you must pay for attackers via a form of cryptocurrency, usually Bitcoin.
- Use your computer during a DDoS attack. By using the backdoor to gain super-user access to your system, cyber criminals can take control of your computer remotely, by entering it into a network of hacked computers, also called a botnet. With this botnet zombie computer, criminals can then overwhelm a website or network with traffic from the botnet as part of a distributed denial of service (DDoS) attack. Flooding of traffic prevents the website or network from responding to legitimate requests, thus putting the site out of service.
- Cryptojacking malware is designed to use your system’s resources to exploit cryptocurrency. In short, whenever someone exchanges a cryptocurrency, the transaction is recorded on an encrypted virtual ledger called blockchain. Encryption is the process of validating these online transactions in exchange for more cryptocurrency and requires enormous computing power. Instead of buying the expensive hardware needed for cryptography, the criminals discovered that they could simply enroll hacked computers into a botnet running in the same way as expensive cryptography batteries.
When backdoor finds its way to the system, it performs these activities:
- Enables the intruder to create, delete, rename, copy or modify any file, execute various commands, modify system settings, modify the Windows registry, execute, control and close applications, install other software and parasites.
- Enables the attacker to control the hardware devices on the computer, to change related settings, to shut down or restart a computer at any time.
- Select sensitive personal information, valuable documents, passwords, login names, identity information, record user activity, and track web browsing habits.
- Save keystrokes and capture screenshots. In addition, sends all collected data to a predefined email address, uploads it to a predetermined FTP server, or forwards it over a background Internet connection to a remote host.
- Infects the files, corrupts the installed applications and damages the entire system.
- Distributes infected files to remote computers with certain security vulnerabilities, launches attacks against remote hosts defined by hackers.
- Installs a hidden FTP server that can be used by malicious people for various illegal purposes.
- Degrades Internet connection speed and overall system performance.
- Prevents deletion by hiding files and providing no uninstall functionality.
How to avoid backdoors?
This type of threat can take many forms. It may be software dedicated to creating doors against other malware. A piece of code hidden in software; a misconfigured remote administration system; passwords that are not updated by the user on massive platforms.
As a standard security measure, it is necessary for each ecosystem to be regularly monitored for violations. Even if a system defines the use of backdoor as an administrative resource, this solution is not safe because it can be exploited by cybercriminals without being noticed.
Several resources can be used to avoid this problem. The use of firewalls on devices and networks is important. However, a bad configuration of the firewall could be a violation allowing new ports. Configured correctly, the firewall will be able to manage authorized users and monitor traffic. Another application is the intrusion prevention system, which can monitor signatures indicating malicious activity.
In some cases, using an application firewall can also prevent the presence of backdoors and targeted attacks by controlling the execution of files and data requested by the application. For example, RAM Antivirus application firewall can prevent the execution / installation of new unwanted applications. In addition, the anti-malware can be detected in the end if the distribution of this type of malicious code is done by email, URL, file sharing via FTP, etc.